/*******************************************************************************
 * Copyright 2009, 2010 Innovation Gate GmbH. All Rights Reserved.
 * 
 * This file is part of the OpenWGA server platform.
 * 
 * OpenWGA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * In addition, a special exception is granted by the copyright holders
 * of OpenWGA called "OpenWGA plugin exception". You should have received
 * a copy of this exception along with OpenWGA in file COPYING.
 * If not, see <http://www.openwga.com/gpl-plugin-exception>.
 * 
 * OpenWGA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with OpenWGA in file COPYING.
 * If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package de.innovationgate.wgpublisher.expressions;

import java.util.Map;

import de.innovationgate.webgate.api.WGAPIException;
import de.innovationgate.webgate.api.WGDatabase;
import de.innovationgate.webgate.api.WGDocument;
import de.innovationgate.webgate.api.WGExpressionException;
import de.innovationgate.wgpublisher.webtml.utils.TMLContext;

public class NativeExpressionEngine implements ExpressionEngine {
	public ExpressionResult evaluateExpression(String expression, TMLContext context, int type, Map objects) {
		
		WGDocument doc = context.getapiobject();
		if (!doc.getDatabase().hasFeature(WGDatabase.FEATURE_NATIVEEXPRESSIONS)) {
			return new ExpressionResult(null, false, false, new WGExpressionException("This database does not support native expressions", expression));
		}
		
		Object result = null;
		
		try {
			result = doc.evaluateExpression(expression);
		}         
        catch (WGExpressionException e) {
            return new ExpressionResult(null, false, true, e);
        }
        catch (WGAPIException e) {
            return new ExpressionResult(null, false, true, new WGExpressionException(e.getMessage(), expression, e));
        }
		return new ExpressionResult(result, doc.resultIsTrue(result), doc.resultIsFalse(result), null);
		
	}

    public void close() {
    }

}

